#! /usr/bin/env python
# coding=utf-8
# Copyright (c) 2019 Uber Technologies, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
import argparse
import random


def split(input_path, output1, output2, split):
    with open(input_path, 'r') as file:
        lines = file.readlines()

    random.shuffle(lines)
    split_idx = int(len(lines) * split)

    with open(output1, 'w') as f:
        for line in lines[:split_idx]:
            line = line if line.endswith('\n') else line + '\n'
            f.write(line)

    with open(output2, 'w') as f:
        for line in lines[split_idx:]:
            line = line if line.endswith('\n') else line + '\n'
            f.write(line)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description='Split a file based on its lines'
    )

    parser.add_argument('-i', '--input', required=True,
                        help='input file names')
    parser.add_argument(
        '-o1',
        '--output1',
        required=True,
        help='output 1 file name'
    )
    parser.add_argument(
        '-o2',
        '--output2',
        required=True,
        help='output 2 file name'
    )
    parser.add_argument(
        '-s',
        '--split',
        required=True,
        type=float,
        default=0.8,
        help='percentage of the split'
    )

    args = parser.parse_args()

    split(args.input, args.output1, args.output2, args.split)
